package com.hadoop.test;

import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

public class MaxTemperatureDriver extends Configured implements Tool {
    @Override
    public int run(String[] args) throws Exception {
        if (args.length != 2) {
            System.err.printf(": is [generic options] <input, <output>\n",
            getClass().getSimpleName());
            ToolRunner. printGenericCommandUsage(System.err);
            return -1;
        }
        Job job = new Job(getConf(), "Max temperature");
        job.setJarByClass(getClass());
        FileInputFormat.addInputPath(job, new Path(args[0]));
        FileOutputFormat.setOutputPath(job, new Path(args[1]));
        job.setMapperClass(MaxTemperatureMapper.class);
        job.setCombinerClass (MaxTemperatureReducer.class);
        job.setReducerClass(MaxTemperatureReducer.class );
        job.setOutputKeyClass(Text.class); job.setOutputValueClass(IntWritable.class);
        return job.waitForCompletion(true) ? 0 : 1;
    }

    public static void main(String[] args) throws Exception {
        args = new String[2];
        args[0] = "C:\\Users\\123456\\Desktop\\天气数据.txt";
        args[1] = "C:\\Users\\123456\\Desktop\\分析结果.txt";
        int exitCode = ToolRunner.run(new MaxTemperatureDriver(), args);
        System.exit(exitCode);
    }
}
